Click on the "Add Plugin" menu on your Wordpress admin panel. After page loaded, click on the "Upload Plugin" at the right side of the "Add Plugin" title.
Click "Choose File" and select the plugin file (empower-plugin.zip) you downloaded. Click here to download Wordpress Plugin
After choosing the Empower Plugin file, click Install Now button
You will be leaded to plugin installation page. When installation completes, click on the Activate Plugin button.
Note: If you are updating your plugin with a newer version, follow those steps and click on the Replace current with uploaded button.